Steam boiler



R. G. FISHER March 6, 1951 STEAM BOILER 2 Sheets-Sheet 1 Filed Oct. 10. 1949 3mm ROBERT G, FISHER.

ATTORNEY R. G. FISHER March 6, 1951 STEAM BOILER Filed Oct. 10. 1949 2 Sheets-Sheet 2 (HI/WW ROIBERT G. F: sHl-zl w 0 AT TOP/VS) Patented Mar. 6, 1951 UNITED STATES PATENT OFFICE STEAM BOILER v Robert G. Fisher, Coplay, Pa.

Application October 10, 1949, Serial No. 120,561

My invention relates to steam boilers.

An important object of the invention is to provide a boiler which may be formed of sheet metal plates welded together, in assembled relation, to produce the desired unit.

A further object of the invention is to provide an arrangement of flues, which is highly simplified, and will produce the maximum heat exchange.

A further object of the invention is to provide means whereby free access may be had to the flues for a quick and convenient cleaning of the same.

A further object of the invention is to provide a boiler of the above mentioned character which is well adapted to be used as a relatively small unit, for household purposes or the like.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a front elevation of a boiler embodying my invention,

Figure 2 is a vertical section, taken on line 22 of Figure 1,

Figure 3 is a vertical section, taken on line 3--3 of Figure 2,

Figure 4 is a horizontal section, taken on line 4-4 of Figure 2, and

Figure 5 is a horizontal section, taken on line 5-5 of Figure 2.

In the drawings, the numerals III, II, I2, and I3 designate horizontal lines, which are much wider than tall and are rectangular in transverse vertical section and longitudinal vertical section. Each flue embodies a horizontal top I4 and bottom I5, formed of sheet metal and vertical sides I6, and these parts are secured together by welding to form a gas-tight joint. The top flue I0, near its forward end, is connected with the next lower flue II, by a vertical riser Il, extending transversely of these flues throughout their entire width. This riser includes sides I8 and ends It. The riser is open at its top and bottom and the top of the riser is inserted within an opening 2% formed in the bottom I5 of the flue It. The lower end of the riser is inserted within an opening 2I formed in the top I4 of the flue I I. These parts are welded together to form a gas-tight joint. The numeral 22 designates a vertical riser identical with the riser I1, and connecting the 2 Claims. (Cl. 122214) of these flues. The numeral 23 designates a vertical riser which is identical with the riser I! and connects the bottom I5 of the flue I2 with the top I4 of the flue I3. The numeral 2i designates a vertical riser which is identical with the riser I'I, except that it is wider. The riser 24 has its top mounted within an opening 25 formed in the bottom I5 of the flue I3 and the lower end of this riser is-mounted in an opening 26, formed in the horizontal crown plate 2'! of a firebox 28. This firebox includes the crown plate 2?, sides 29, a front plate and rear end plate 3|, these parts being welded together to form a gas-tight joint. The bottom of the firebox 28 is open, as shown.

All of the risers are welded in place within their openings to form a gas-tight'joint. The riser 24 is near the rear end of the flue I3. It is thus seen that the products of combustion will pass from the firebox 28 and pass upwardly into the successive horizontally arranged fines, and travel longitudinally within the successive flues in opposite directions. The front end so of the fire box has an opening 32 to receive a tube 33, welded in place to form a gas-tight joint. This tube is rectangular in vertical section and is horizontally elongated. Arranged beneath the crown plate 21 and rigidly secured thereto by welding or the like are horizontal tracks 34, disposed inwardly of the sides 29. These tracks slidably receive an adjustable damper 35 which may be moved to positions for covering the bore of the riser 2 3, thus regulating the draft from the firebox. This damper may be moved by any suitable means, and I have shown a rod 3 6 secured to the same, slidable within the tube 31, mounted within an open-,

ing formed in the rear end 3I. The rod 3% may extend to the exterior of the boiler. A horizontal flange 38 is welded to the bottom of the firebox 28, as shown. The top I 4 of the flue is has an opening 39 formed therein, near its rear end for receiving an outlet pipe or pipe coupling 40,

welded within the opening 39 to form a gas-tight joint. The top I4 of the flue III has vertical stay rods II welded thereto. Vertical stay rods 32 are arranged between the bottom I5 of the flue It and the top I4 of the fire tube II and are welded to the same. Vertical stay rods 23 are welded to thebottom I5 of the flue II and the top Mi of the fire tube I2; vertical stay rods M. are welded to the bottom I 5 of the flue I2 and the top It of the flue I3; and vertical stay rods are welded to the bottom I5 of the flue I3 and the crown plates 21. It is obvious that these stay rods and risers securely and permanently connect the horizontally arranged flues and firebox, which constitutes a unit. Horizontal stay rods 46 are welded to the sides of all of the flues, and horizontal stay rods 41 are welded to the sides 29 of the firebox 28. Horizontal stay rods 48 are welded to the end 3| of the firebox, Figure 2.

The numeral 49 designates the main casing or shell of the boiler, which is shown as vertical, and rectangular in vertical and horizontal cross section. This casing comprises a forward sheet metal plate 58 .and a rear sheet metal plate 5|. These plates '58 and 5| have pairs of oppositely arranged horizontal openings 52, formed therein, for receiving the ends of'the fiues, II! to I3 inclusive, which are welded within these openings to form a gas-tight joint. The plate 50 has an opening 53 for receiving the tube 33 which may be welded therein to form agas-tight joint, and the plate 5| has an opening 54 formed therein to receive the tube 31. In assembling the boiler, the plates 58 and 5| are first applied to the ends of the flues I to l3 inclusive, and these parts welded together. The tube 33 and tube 31 extend into their openings and are welded in place. The opposite ends of the flues [0 to I3 inclusive are open and these open ends are substantially flush with the outer faces of the plates 50 and 51. The stay rods 48 are also welded to the plate Figure 2. With the parts thus assembled the side plates 55 may benext applied to the edges of the front and rear plates 58 .and 5| and will be welded to the same. .A top plate 56 is provided having an opening 51 to receive the pipe 48 and this top plate is welded to the front and rear plates and side plates. All of these plates are formed of sheet metal. The top plate 56 is welded to the stay rods 4| and the side plates 55 are welded to the horizontal stay rods 46 and 41. The flange 38 is welded to the main casing, as shown at 38'.

The numerals 58 and 59 designate front and rear removable sheet metal plates, which are arranged to cover the open endsof the flues Ii! to l3 inclusive, and these plates are held in position by removable bolts 58. Arranged between the plates 58 and 59 and the-plates 58.and 5|, respectively, are sheets of packing material 6!, such as asbestos sheets. These sheets are preferably of the same dimensions as the metal plates 58 and 59. When the boltsfili are screwed up, the-packing sheetsBl are pressed against the ends of the flues l0 to 13 inclusive, forming a gas-tight joint between such ends and the removable plates 58 and 59.

The front plate '58 is shown as provided with a horizontal slot 82 for the passage of a hot water coil 63, which may rest upon the top [4 .of the flue I8. The ends 64 of this hot water coil pass through openings formed in'a plate 65, arranged upon the front plate 58 and detachably secured thereby by-bolts 66. A suitable packing sheet '81 is disposed inwardly of the plate 65.

The front plate 58 isequipped with a vertically swinging door 53, t0 cover the tube '33. The front plate is-also equipped with an opening 69 which leads into a compartment 18 which.may serve as an ash pit. Theopening 89 is covered by ahorizontally swinging door H The numeral -12 designates inlet couplings, secured to the rear plate 5! near its lower end. Secured to the top plate 56 are tubular outlet couplings 13, arranged near the front plate 58. A tubular outlet coupling 14 is-also mounted upon the :top plate '56 .near and between the tubular couplin 13.and maybe :usedfor connecting a pressure gauge with themain casing. Vertically spaced tubular couplings 15 are mounted upon one side plate 55 near its top, for connection with a water gauge. The tubular couplings l2, l3, and 15 are identical with the tubular coupling 14.

As clearly shown in Figure 3, the sides of the flues are spaced from the side plates 55 of the main casing, providing vertical passages 16 for the water, and there are side passages 11, outwardly of .and adjacent to the sides 29, and in communication with the "passages 16. The ends of the firebox 28 are spaced from the front plate 58 and rear plate 5| providing water passages 18. There are horizontal water passages 19 between the flues which are in free communication with thezpassages 16.

I contemplate using the boiler in connection with an oilburner, of any well-known or preferred type. The boiler may also employ coal as fuel, in which event a suitable grate, not shown, would be positioned at the bottom of the firebox. Since oil burning units and grates for coal are well-known, the same have not been shown.

The water is introduced into the passages of the main outer casing between it and the flues, by feeding the water through the inlet couplings I2. The steam may be withdrawn from the outlet couplings 13. The flues provide a large heat-exchange area, and the boiler has a high degree of efficiency in operation. The flues may be readily cleaned by removing the plates 58 and 59, and since they are straight and open at both ends, a brush or other implement may be conveniently manipulated in cleaning the flues.

While I have shown the flues horizontally arranged, yet they may be arranged vertically. The boiler is well'adapted for use as a small household unit, but may beembodied in any size boiler. The apparatus is of simple construction.

It is to be understood that the form of my invention herewith shown .and described is to be taken as a preferred example of the same and that various changes in the shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having described my invention, I claim:

1. A boiler comprising a main rectangular casing including a pair of opposed side plates having transversely elongated rectangular openings extending for the major portion of the width of the side plates, a plurality of vertically spaced rectangular flues extending between the side plates, each flue being transversely elongated-and extending for the major portion of the width of the side plates, the opposite ends of the flues being open and mounted within the rectangular openings of the side plates, a unitary common cover plate mounted upon each side plate and completely covering all of the adjacent open ends of the flues, each common cover plate extending for the major portion of the width of the adjacent side plate, conduit means connecting the flues in series, and a second opposed pair of side plates connected with the first-named side plates and forming therewith a water chamber surrounding thefiues.

.2. A boiler comprisinga main casing including a pair of opposed side plates having transversely elongated openings extending for the major portion .of the width of the side plates, a plurality of vertically spaced flues extending between the side plates, each flue being transversely elongated and extending for the major 5 portion of the width of the side plates, the opposite ends of the flues being open and mounted within the openings of the side plates, a unitary substantially flat common cover plate mounted upon each side plate adjacent to the open ends of the flues and completely covering all of the open ends, risers connecting the vertically spaced flues in series, a second pair of side plates connected with the first-named side plates and forming therewith a water chamber surrounding the flues, and a fire box arranged within the main casing below the lowermost flues and communicating with such flue, the fire box being spaced from the first and second named side plates of the main casing for forming a water chamber surrounding the fire box.

ROBERT G. FISHER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 395,688 Bigley Jan. 9, 1889 440,300 Blondin Nov. 11, 1900 1,671,135 Stockwell May 29, 1928 1,749,904 Casserly Mar. 11, 1930 

